and derived all essentially different minimal octdokus

here are the counts per number of clues

- Code: Select all
`507 22`

55336 23

101245 24

37816 25

382 26

18 posts
• Page **2** of **2** • 1, **2**

I went through the current catalog of 47909 17s

and derived all essentially different minimal octdokus

here are the counts per number of clues

and derived all essentially different minimal octdokus

here are the counts per number of clues

- Code: Select all
`507 22`

55336 23

101245 24

37816 25

382 26

- gsf
- 2014 Supporter
**Posts:**7306**Joined:**21 September 2005**Location:**NJ USA

gsf wrote:

- Code: Select all
`507 22`

55336 23

I will take stock of these findings ..........

Its not so easy to move from one puzzle to another.

the improvement from

nine less clue positions

one less clue value

three less clues........................... isnt quite enough.

Im thinking there must be equivalent clues, but how many......[obviously keep the 9]

Maybe there will always be 3 [equiv] clues.

Will see.

Thanks for your effort

C

- coloin
**Posts:**1633**Joined:**05 May 2005

OK.... a little bit of thought.

What we are trying to do is generate these 14-plus-9 octdoku/vanilla sudoku puzzles.

For a long while we have randomly made new 17-puzzles and they are still being found. Can we get them all ?

By making these oct-duku puzzles with 14 clues we can very easily search for a 17. Almost all 17s have 3 of one particular clue value.

It has to be easier making these 14 octuku puzzles. [3 less clues, 9 less spaces and 1 less clue value]

gsf has made and canicalized the 13-plus-9 and 14-plus-9 puzzles from gordons list.

We can also get these puzzles from these here -

[18-puzzles with a 14 plus 4 configuration] [********4]

[19-puzzles with a 14 plus 5 configuration] [********5]

[20-puzzles with a 14 plus 6 configuration] [********6][?exists]

they are not common compared to other puzzles with n-clues.

These all do exist. - If you take a 17-puzzle with a diagonal pattern of the same clue value eg in B1B5B9 - replacing these 3 clues of the 9 rookery with the other 6 always gives a non-minimal puzzle and sometimes gives a 20-clue minimal puzzle with [********6]

We shouldnt attempt the 14-plus-9s untill we improved our method, and perhaps not before we can show we have all the 13-plus-9 octdoku.

These will all come from the 18-puzzles with [********5] distribution

optimization

It cant be wrong to fix one clue.

It cant be wrong to always be able to find a "gap" in a puzzle.

I believe all puzzles must have a clue like the 1 at r1c7 [not proven]

ie there is a box like

maybe this can be improved on.

always pick all the 9s

always pick the 1 at r1c7 and

never pick any of the clues in r1c2-r1c6 and r1c8 and r1c9

In the two types of 18-puzzles I found at random - those with [011222235] and those with [011122335]

In both we "only" have to iterate 12 clues with 7 clue values over ~ 55 positions each. [still too much]

For now I will look at the incidence and configuration of possible

[********5]&[********4] for the 18s

[********5] for the 19s

[********6] for the 20s and poss 19s

C

What we are trying to do is generate these 14-plus-9 octdoku/vanilla sudoku puzzles.

For a long while we have randomly made new 17-puzzles and they are still being found. Can we get them all ?

By making these oct-duku puzzles with 14 clues we can very easily search for a 17. Almost all 17s have 3 of one particular clue value.

It has to be easier making these 14 octuku puzzles. [3 less clues, 9 less spaces and 1 less clue value]

gsf has made and canicalized the 13-plus-9 and 14-plus-9 puzzles from gordons list.

We can also get these puzzles from these here -

[18-puzzles with a 14 plus 4 configuration] [********4]

[19-puzzles with a 14 plus 5 configuration] [********5]

[20-puzzles with a 14 plus 6 configuration] [********6][?exists]

they are not common compared to other puzzles with n-clues.

These all do exist. - If you take a 17-puzzle with a diagonal pattern of the same clue value eg in B1B5B9 - replacing these 3 clues of the 9 rookery with the other 6 always gives a non-minimal puzzle and sometimes gives a 20-clue minimal puzzle with [********6]

We shouldnt attempt the 14-plus-9s untill we improved our method, and perhaps not before we can show we have all the 13-plus-9 octdoku.

These will all come from the 18-puzzles with [********5] distribution

optimization

It cant be wrong to fix one clue.

It cant be wrong to always be able to find a "gap" in a puzzle.

I believe all puzzles must have a clue like the 1 at r1c7 [not proven]

ie there is a box like

- Code: Select all
`+---+`

|1**|

|...|

|9..|

+---+

maybe this can be improved on.

- Code: Select all
`+---+---+---+`

|9**|***|1**|

|...|9..|...|

|...|...|9..|

+---+---+---+

|.9.|...|...|

|...|.9.|...|

|...|...|.9.|

+---+---+---+

|..9|...|...|

|...|..9|...|

|...|...|..9|

+---+---+---+

always pick all the 9s

always pick the 1 at r1c7 and

never pick any of the clues in r1c2-r1c6 and r1c8 and r1c9

- Code: Select all
`+---+---+---+`

|987|654|123|

|...|9..|...|

|...|...|9..|

+---+---+---+

|.9.|...|...|

|...|.9.|...|

|...|...|.9.|

+---+---+---+

|..9|...|...|

|...|..9|...|

|...|...|..9|

+---+---+---+

In the two types of 18-puzzles I found at random - those with [011222235] and those with [011122335]

In both we "only" have to iterate 12 clues with 7 clue values over ~ 55 positions each. [still too much]

For now I will look at the incidence and configuration of possible

[********5]&[********4] for the 18s

[********5] for the 19s

[********6] for the 20s and poss 19s

C

- coloin
**Posts:**1633**Joined:**05 May 2005

18 posts
• Page **2** of **2** • 1, **2**